Who discovered that the atomic mass of elements can vary within the same identity due to changing neutron levels, establishing 'Isotopes'? MCQ with Answer and Explanation

Question
Who discovered that the atomic mass of elements can vary within the same identity due to changing neutron levels, establishing 'Isotopes'?
A. Frederick Soddy
B. J.J. Thomson
C. James Chadwick
D. Ernest Rutherford
Answer: Option A
Solution (By JKSSB Mock Tests)
Soddy introduced the concept of isotopes in 1913, proving that elements can have identical chemical behaviors but different radioactive profiles.
This question belongs to: Static General Knowledge Inventions and Discoveries
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Question #1
Who invented the first practical mechanical television system?
A. Philo Farnsworth
B. Guglielmo Marconi
C. Vladimir Zworykin
D. John Logie Baird
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Correct Answer: Option D

Explanation:
John Logie Baird demonstrated the first working mechanical television system in the 1920s.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #2
Who invented the radar (Radio Detection and Ranging) system used by Britain during World War II?
A. Robert Watson-Watt
B. Heinrich Hertz
C. Guglielmo Marconi
D. Alan Turing
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Correct Answer: Option A

Explanation:
Sir Robert Watson-Watt developed the first practical and deployable radar tracking systems for aircraft tracking.
This question belongs to: Static General Knowledge Inventions and Discoveries
Question #3
Who invented the lightning rod and bifocal lenses?
A. Thomas Edison
B. Nikola Tesla
C. Michael Faraday
D. Benjamin Franklin
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Correct Answer: Option D

Explanation:
Benjamin Franklin invented the lightning rod, bifocal spectacles, and the Franklin stove.
This question belongs to: Static General Knowledge Inventions and Discoveries
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